STARTING AN EXPERIMENT USING FROGS 
                       --  THE ANSWERS

 

23.   In a study of how temperature affects activity rate in frogs, the independent variable is

                                                                                                   __ TEMPERATURE__

24.   This variable often varies through a range of data.  The activity rate of the frogs should differ

             at several different                                                                   __ TEMPERATURES __

 

25.   Temperature is the causal variable because the experimenter has some choice in its values.  We
        could do the experiment by comparing activity rate at 5 versus 15 degrees C, or at 10, 20, 30,

        & 40 degrees C.   This is known as the    ___  INDEPENDENT ___   variable.

26.   It is a change in the temperature that causes something else (the Dependent Variable) to also
        change.  The initial variations in temperature causes a change in the frogs ACTIVITY RATE.  

 

NOTE -- For many experiments, time is displayed along the X axis as the independent variable, but it is not the cause of something.  There may be several non measurable independent variables that over a period of time have caused some other factor to change.

 

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